The 1:1 thing with Sram started with their GripShift system. They had to change the ratio in order to get the proper spacing. Even though GripShift does make a 2:1 ratio (Shimano compatible) shifter (The Attack), it is not as precise and requires constant tuning. Since SRAM made so many claims about the benefits of 1:1, they stuck with it when they went to triggers.

The thing I really like about SRAM is the direct routing of the shift cable into the derailleur. With a Shimano system you have to have a wide loop in the cable. A shorter cable = crisper shift. and a better feel. Plus, less friction due to lack of a tight bend in the housing.

I'm running an XTR system right now and have no problems with it. However, it is old skool ('00 vintage) and 8-speed. I'm no retro grouch in most things, but I never understood the benefit of a 9-speed system. It's more finicky to set-up, requires more frequent tuning, is more delicate and clogs quicker.

When I was running 9-speed on my bike, I had constant problems with broken chains, ghost shifts, weeds in the cassette.....etc. I went back to 8-speed and eliminated almost all my shifting woes.

My next system will most likely be a Sram set-up.

Just putting off going back to 9-speed as long as possilble. As long as NOS 8-speed stuff is still available, that's what you'll find on my bikes.